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CVE-2026-50627 — Vulnerability in...

CRITICAL

Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator

Published June 12, 2026Updated August 20, 2026Source: osv

Summary

The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience) claims of incoming JWT access tokens. This allows a JWT issued for one Resource Server to be successfully replayed against a completely different Resource Server, leading to Token Confusion/Routing attacks. Users are recommended to upgrade to versions 4.2.2 or 4.1.7, which fixes this issue.

Advisory Timeline

  • First published June 12, 2026 (122 days ago).
  • Last revised August 20, 2026 — 69 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.apache.cxf:cxf-rt-rs-security-oauth2 to 4.1.7 or later
<!-- Update pom.xml dependency version to 4.1.7 for org.apache.cxf:cxf-rt-rs-security-oauth2 -->
Maven
Update org.apache.cxf:cxf-rt-rs-security-oauth2 to 4.2.2 or later
<!-- Update pom.xml dependency version to 4.2.2 for org.apache.cxf:cxf-rt-rs-security-oauth2 -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
org.apache.cxf:cxf-rt-rs-security-oauth2
maven
2.6.0, 2.6.1, 2.6.10, 2.6.11 (+155 more)4.1.7
org.apache.cxf:cxf-rt-rs-security-oauth2
maven
4.2.0, 4.2.14.2.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-50627?
Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-50627?
CVE-2026-50627 affects org.apache.cxf:cxf-rt-rs-security-oauth2. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-50627 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-9mrv-8pvf-hf4m

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